Tailstock for lathes, grinders, and the like



A. STORM ET AL TAILSTOCK FOR LATHES, GRINDERS, AND THE LIKE Original Filed March 21, 1950 2 Sheets-Sheet 1 w 1 w R %M.\|F N w M VN xi W 0\ 7 m\ A I P. W 5 7% N\ m G M km Q m. A 3 Q .QNQI E m S NM m \v MN mw Q N E ta W w W \v w NM. MW /MM. \N k\ w m & N r i 67 7 Aug. 15, A STORM r AL TAILSTOCK FOR LATHES, GRINDERS, AND THE LIKE Original Filed March 21, 1930 2 Sheets-Sheet 2 fldoipji 4 201 177 w A jk Patented Ai -lg. ii I hifimT -TAILSTOCK FOR LATHES; GRINDER'S, AND? I i jAdol'phf Storm and Thorsen, 'Mi

n eapolis,

"Minn assignors to, Storm lyla mtlfa'cturing (1b.; -lnc., Minneapolis, Minn, a- Qorporatioii o f Minnesota OriginalapplicationMarch21, No

' 437,741. )Divided and this application February 18, 1931. Serial No. 516,652,; I

Our present invention has for its object 'the provisionco'f a simple and .hi'ghly efficient dead center and tailstockior lathes, grinders'and the like. The,invention avhile intendedior general" use, is especially designed for use inlathes and I grinders for finishing pistons for internal cornbustion engines'where very accurate work is es- The, inventionis a, division offonrpending United States application-torLetters Patent-for fl-piston turning and grinding machine filed Marche2lst, 1930, under Serial Numberylfll. f Generally stated, theinvention'consists of the novel devices and oombinations of-devices-here-.

inafter described 1 and defined in the claims.

In the accompanying. drawings; which fillustrate the invention like characters indicate like parts throughout the several views. '1 I a Referring to the drawings:

Fig.1 is a fragmentary front elevationshowing a piston turning and grinding n achine having machine illustrated and id-which the invention is embodied, the numeral 9 indicates the bed, '10

the headstock, lljthe live center, which'is the suh ject matter of a division of the applicationabove identified, and 12 the dead center,

A piston Yis held betweenthe centers 11 and 12 (see Fig,1) v

The dead center 12 is reinovablymounted in the inner end of a tubular tailstock spindle 13,

axially aligned with the live center 11 and held in place by a long tapered fit see Fig. 2).

To secure triue axial movementof the dead center 12 in respect to the live center '11, the

support for the spindle 13, to-wit: the tailstock 1 1, is rigidly secured in respect to the bed 9 and the entire axialadjustment of said dead center is made in respect thereto. On account .of the small size of the. dead center 12, it is not practical to movethe same axially beyond the tailstock 14 to the full capacity of the machine, and for this reason said tailstock is provided with a tubular extension bar -15. This extension bar 15 and live bearing 24' by the-hub of the hand wheel=25and is Sofia large diameter and has a pair of axially I space internal seats 16 and lTat its inner end ,7 7 portion, in whichsaid -spind1e isf mounted for axial adjustment. U k I vThespindle 13,- is held from turning aboutflit's longitudinalaxisinlthe seats 16 and 1'1 by a flat key 18 and a cooperating longitudinal kefyway,19

- in the spindle 13,; in, which said jkey: extends. .Saidf ky I8 is anchored to thB 'XtehsiOfLbar" 1 5 in respect to thespindle ,13, by a round pin 20' formed therewith, jinterni'ediatefo'f itskfendsi and turnably mountedin a b'or'e-likeradial. seat 21in the extension bar I15. This pin 20 .pe'rini tslthe key s it lie in the kyway ,19 withoutanybinding action thereon. ,To axially adjust the spindle 13 in the extension bar. 15, there is provided a long ffeed screw 22 which extends axially intothe'spindle 13 andextension bar l5.from the outer ends thereofand 1 has" threaded engagement with a nutacting member 23 .f xed in said outer-end oi -the spindle 13. .The outer end portion'oi? the feed screw22 is turnably mounted in; a bearing 24 s'ecured to'the ,outerend of the extension bar 15 by threadedengage inentm e 'A ha 'nd wheel. 25, applied: to the i eed ascrew 22 outward of thebearing 24, is provided iorturningtheieed-screw 22 in the nut-acting mer'nbe'r;

23 and thereby; impart axial movementgto the screw 22'is held against axial, movement in the a collar 26, applied to said feedscrew withinthe extensionbar 15 m U \T n 'l3z m y be e re o. e ex nsien bar 15 in any of its axial adjustments bya lock, comprising a 'cone shaped' centering wedge 27, mounted in an internal conical seat 28 in the external screw threaded engagement with the inner end of the extension bar 15 and impinges against the, base of said wedge. I a

By ,turningthe nut 29 onto the extension bar;

spindle'j 1 3 in the extension bar 15. The feed --inner end of the spindle-13, and a cooperating knurled hand nut 29. Said: centering wedge 27 *is transversally divided, encircles the spindle 13 to be contracted thereon by the nut 29, which has 15,-the centering wedge 27 will be moved axially.v

spindle 13 to center and frictionally hold the same where adjusted in the extension bar 15. froiiacilitate the contraction of the centering wedge 26'onto the spindle 13', the same is weakened at a plurality of circumferentiallyspaced points by external longitudinal grooves 30 formed therein'(see-Fig. 8). Y

'into'i'ts seat 28 and thereby contracted onto the The extension bar 15 is mounted in a pair of axially spaced bearings 31 in the tailstock 14, for movement by hand axiallytoward or from' the live center 11 with a free sliding movement. This extension bar 15 is held from turning in the bearings 31 about its longitudinal axis by a key 32 and a cooperating keyway 33, similar to' the key 18 and keyway 19. It will be noted that the bearings 31 are continuous and unbroken throughout their entire circumference so that there is no give therein, and hold said bar while the same is being axially adjusted in true axial alignment with the live center 11. The hand wheel 25, in addition to affording means by which the feed screw 22 may be turned, also affords convenient means by which the extension bar 15 may be moved axially. 7

Two clamps 34, one in each bearing 31, are provided for rigidly securing the extension bar 15 in different axial adjustments in the tailstock 14. Each clamp 34'comprises a pair of axially aligned cylindrical wedges 35 on a rod 36, having on one end a crank-acting handle 37. Said pairs of Wedges 35 are mounted in cylindrical seats in the tops of the bearings 31 for endwise sliding movement toward or from each other transversally of the extension bar 15. The wedges 35 of each pair are arranged to impinge against opposite surfaces of the extension bar 15 (see Fig. 6).

The rod 36 has screw threaded engagement with the outer wedge 35, and the inner wedge 35 is loose on said rod and engages the hub of the handle 3'7 as a base of resistance. A movement of the handles 37 to set the clamps 34 will move the wedges 35 thereof axially toward each other into frictional engagement with the exten- V sion bar 15.

7 'Verse slots 42 in the tailstock 14; Nuts 41 on the studs 41 impinge against the tailstock 14 and frictionally clamp said tailstock onto the base block 38 and said base block onto the bed 9. The purpose of the slots 42 is to permit the required movement of the tailstock 14 in respect to the studs 41 during transverse adjustment of said tailstock on the base block 38 to horizontally align the dead center 12 with the live center 11.

For transversely adjusting the tailstock 14 on the base block 38, there is provided a pair of opposing adjusting screws 43 which have threaded tailstock where positioned by the adjusting screws From the above description it is evident that a slight movement of the handles 3'7, which are conveniently located, will release the extension A long pair of set screws 45, havbar 15 and permit free axial sliding movement thereof in the bearings 31. By loosening the hand nut 29 and turning the hand wheel 35, the spindle 1.3 may be axially adjusted in the extension bar 15 for imparting fine axial adjustments to the dead center 12, in respect to the live center 11. This mounting the dead center 12 makes it possible to very quickly and easily axially adjust said dead center, and at the same time is always positively held in-true axial alignment with the live center 11.

What we claim is: In a machine of the class described, a bed, a tailstock base block independent of the bed and rigidly secured thereto, said base block having a pair of upstanding guide lugs endwise spaced transversely thereof in a channel in the tailstock.

and holding said tailstoclcfor straight line transverse sliding movement, said tailstock having a depending lug between the two guide lugs, said base block having a pair of opposing adjusting screws that impinge against opposite faces of the lug on the tailstock, a pair of nut-equipped screw-studs anchored to the base, extending through holes in the base block and transverse slots in the tailstock and normally holding the tailstock clamped onto the base block, and setscrews in the tailstocl: that impinge against one of the faces of the guide lugs and hold the tailstock frictionally clamped onto the opposite faces of the guide lugs.

' ADOLPH STORM. THOR THORSEN. 

